SPS 2001 - Announcement Web Part

An author of one of our workspaces added a link in the Announcements webpart to a word document that contains several links to PowerPointpresentations. She also did a link with an html page that contained links toPowerPoint presentations, In both cases, she is able to access however usersget prompted for NT credentials and then an unauthorized message when theyclick the link. Why is that happening? Is there a permission issue here?

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